Skiving machine



Nov. 17, 1970 K. HACKER HAL SKIVING MACHINE 8 Sheets-Sheet 1 Filed March 4, 1969 Mm an e n R MY 7 mmm mwm mrmmuo w fian l wua YA Y B FIG.

Nov. 17, 1970 K. HACKER, ETAL 3,540,244

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SKIVING MACHINE 8 Sheets-Sheet 3 Filed March 4, 1969 FIG. 40'

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K. HACKER ET AL Nov. 17., 1970 SKIVING MACHINE I 8 Sheets-Sheet 4 Filed March 4, 1969 FIG. 7

FIG. 70

nmw a m x uww vm E eefo wwmwdn I 0 NOV. 17, 1970 HACKER ErAL SKIVING MACHINE 8 Sheets-Sheet 5 Filed March 4, 1969 INVENTOR m! 1' #44409! Gkivrq, 45w ox m/r. 9H1

ATTORNEY NOV. 17, 1970- HAKER ETAL 3,540,244

SKIVING MACHINE Filed Marh 4, 1969 '8 Sheets-Sheet 6 FIG. 9

INVENTOR gun?- 1943's} Illa-w A BY we, baa/l NOV. 17 1970 H K EI'AL SKIVING MACHINE Filed March 4, 1969 8 Sheets-Sheet 7 INVENTOR mgr/Mae 721 068!!! #446 BY 6420 9 4806 flhhb/ff/Ml r- ATTORNEY Nov. 17, 1910 K, HACKER ETAL 3,540,244

SKIVING MACHINE 8 Sheets-Sheet 8 Filed March 4, 1969 0. 0 e o KY O MH (E TC N NA 4R E H VTMW/O mm? W United States Patent 3,540,244 SKIVING MACHINE Kurt Hacker, Stuttgart-Zulfenhausen, Jiirgen Haag, Stuttgart, and Giinter Lerch, Stuttgart-Rot, Germany, assignors to Fortuna-Werke Maschiuenfabrik AG., Stuttgart-Bad Cannstatt, Germany Filed Mar. 4, 1960, Ser. No. 804,120 Claims priority, application Germany, Mar. 5, 1968, F 54,986 Int. Cl. C14b 1/22 US. Cl. 69-9.5 28 Claims ABSTRACT OF THE DISCLOSURE A first presser foot and a second presser foot cooperate with first and second feeding portions of a feed roller which feeds a leather sheet to the circular cutting edge of a rotary tubular cutter. Operator controlled means set at least the first presser foot means to one of two operative positions relative to the cutting edge and feed roller so hat two different scarfs can be cut in the edge of a fed leather sheet fed by the first feeding portion. A third different scarf can be cut in the edge of a leather sheet fed by the second feeding portion of the feed roller. The first presser foot means has different angular positions and different distances from the cutting edge in the two operative positions, and the second presser foot means preferably has a profiled guide edge for producing a folding scarf. The second presser foot means may also be provided with operator controlled means by which it can be set to two different operative positions.

BACKGROUND OF THE DISCLOSURE The present invention relates to a skiving machine permitting the cutting of different scarfs in the edges or margins of a sheet material, particularly leather. Skiving operations of this type are required in the shoe and leather goods industry.

Skiving machines are known which are capable of selectively cutting sloping cuts, steep level cuts and fiat cuts. Particularly, in the leather goods industry, profiled cuts, or partly sloping and partly fiat cuts, are required which are suitable for bending over the margin of the leather sheet.

In accordance with some machines according to the prior art, several presser foot means are successively placed in operative positions, and are mounted on a removable turret support, which has the disadvantage that rapid succession operation is not possible, and that the turret support is in the way of the operator handling the lever blank.

Other skiving machines are known in which one presser foot can be successively placed in different cutting positions. A profiled cut is not possible.

In other skiving machines according to the prior art, one profiled cut is made with a presser foot mounted on an arm. Second and third cuts require additional parts, and for the second cut, the length of the profiled presser foot is reduced. The third cut is made with a fixed presser foot.

Other machines according to the prior art have two presser foot means which can produce only two different cuts.

'ice

SUMMARY OF THE INVENTION It is one object of the invention to overcome the disadvantages of skiving machines according to the prior art, and to provide a skiving machine which, using two presser foot means, is capable of making at least three different scarfs, preferably including a profiled scarf suitable for marginal folding over.

Another object of the invention is to provide a skiving machine in which each of the several positions of the presser foot means, is adjustabe regarding angle and distance relative to the cutting edge.

Another object of the invention is to provide a compact skiving machine which can be easily operated and has only mechanical parts for setting and adjusting the presser foot means.

Another object of the invention is to provide a skiving machine which can be quickly set by the operator to three or four different skiving positions.

Another object of the invention is to provide a skiving machine which has no parts above the top surface on which the sheet material is guided to the cutting edge and to the presser foot means.

With these objects in view, one embodiment of the invention comprises a rotary tubular cutter having a circular cutting edge a portion of which projects through an opening in a housing; a feed roller for feeding sheet material to the cutting edge and having first and second feeding portions at the ends thereof; first presser foot means cooperating with the first feeding portion, and second presser foot means cooperating with the second feeding portion; first and second carrier means supporting the first and second presser foot means, respectively, and being mounted in the housing; and operator controlled means, preferably including a treadle, for quickly moving at least the first carrier means between two positions in which the first presser foot means is positioned in two operative positions relative to the cutting edge and to the first feeding portion. In this manner, two different scarfs can be cut in the edge of the sheet material fed by the first feeding portion, and a third diiferene scarf can be cut in the edge of the sheet material bed by the second feeding portion.

Preferably, one presser foot means has a continuous guide edge or guide face for guiding the sheet material and for making sloping or beveled scarfs, and the other presser foot means has a profiled guide edge or guide face for obtaining profiled scarfs suitable for forming a folded over marginal portion. The sheet material is guided along the top surface of the housing, and all other parts of the machine are located below the plane of this top surface so that the {fed sheet material and the skiving cuts can be fully observed by the operator of the machine, and the operation is not obstructed in any manner.

The feed roller is barrel-shaped to match the contour of the circular cutting edge, and has a circumferential groove between the feeding end portions. The first carrier means is located in the groove for holding the first presser foot means adjacent the first feeding portion and projecting toward one end of the feed roller. The second carrier means is located at the other end of the feed roller for holding the second presser foot adjacent the second end portion.

In accordance with the invention, the first presser foot means is located closer to the operator, and the second presser foot means is located farther spaced from the operator along the circular cutting edge. The rearward located presser foot means is shaped for making profile cuts. The first presser foot means, which is closer to the operator, can be shifted between two operative positions by a treadle, but it is also possible to operate the second presser foot means in a similar manner by the treadle.

The two operative positions of the first presser foot means, and also the operative position, or positions, of the second presser foot means can be set by manually operated adjustable stop means independently of each other. The second profiled presser foot means may be replaced by a presser foot means having a smooth and straight guide face, and which is set to make a third different beveled or flat cut. Evidently, when the second presser foot means is operable between two operative positions, four different skiving cuts are possible. Although room in the housing is taken up by a grinding device for the rotary cutter, by the feeding roller and its supporting and driving parts, as well as by an exhaust nozzle, the presser foot means and the carriers of the same, as well as the operator controlled actuating means for the same, are arranged in the housing so that no arm of the machine is located above the workpiece guiding surface. To save space, each presser foot means is mounted on a holder which is turnable about a longitudinal first axis by an actuating lever, and is mounted on a support lever which is turnable about a second axis transverse to the first axis. These parts are located laterally of the space directly below the presser foot means. The support and adjustment of the feed roller is obtained by simple parts which require only very little space in the housing.

In accordance with the invention, the longitudinal first axis of the holder of the presser foot means passes through a point of the presser foot means in which the guide face of the same intersects with an abutment for the edge of the skived sheet material. This axis is located in a plane perpendicular to the plane of the rotary cutting edge, or is slightly downwardly slanted. The second axis of the support lever is substantially parallel to the axis of the feeding roller. When the presser foot means is turned about the first axis, the angle of the cut slope is varied, and when the support lever is turned about the second axis, the thickness of the cut is varied. The movements of the presser foot means take place along a circular path, and not exactly in the plane of the circular cutting edge, but somewhat slanted to the same, which has no detrimental influence on the precision of the skiving cut. On the contrary, the thicker the workpiece and the cut, the greater is the distance between the guide edge of the presser foot means and the plane of the circular cutting edge, and the better can the workpiece slide over the cutter after having been skived.

An actuating lever is fixed to the holder of the presser foot means and can turn with the same about the first axis between two adjustable stops, preferably two threaded spindles whose knobs project from the front face of the machine housing. A spring biasses the actuating lever to abut the end of one adjusting spindle, while the other adjusting spindle has a flange at the end which is located on the other side of the actuating lever, which abuts this stop flange whenmoved by the operator controlled means to its second position. The two positions of the actuating lever, which are adjustable, correspond to the two operative positions of the presser foot means. The supporting lever, which turns about the second axis, is also urged by a spring against the end of a first adjustable spindle so that the thickness of the skiving out can be adjusted, while a second adjusting spindle has a flange for stopping the adjusting lever in a second position when the same is operated by operator controlled means for setting the presser foot means to the second operative position so that skiving cuts of different thickness are produced in the two operative positions of the presser foot means. A Bowden cable, and other linkage means are operated by telescoping rods which can be attached to a treadle in different positions. The telescoping rods are biassed by inner springs to a normal length, the springs being strong enough to obtain the required shifting of the presser foot means, but yielding when the same are stopped by the adjustable stop spindles in the respective operative positions. Arresting means arrest the treadle in two operating positions.

In view of the fact that the feeding roller, when properly built into the housing, is not required to vary its angular position in relation to the pot-shaped cutter, but that an adjustment of the distance of the feeding roller from the cutting edge must be possible during the skiving of a workpiece, in accordance with the invention, the feed roller is mounted for turning movement, and can be fixed in an adjusted position so that the correct angle of the feed roller relative to the circular cutting edge can be obtained. The shaft of the feed roller is mounted in a bearing of a supporting arm which can be turned in a suppert member which is turnable about a second axis between two adjustable end positions. An adjustable spring and an adjusting spindle permit adjustment of the supporting member about the second axis so that the feed roller can be moved toward and away from the cutting edge, and placed in a position parallel to the same by turning the supporting arm, and then fixing it in the correct position.

In accordance with the invention, the housing includes two housing parts, one of which is movable, and preferably turnable about an axis to an open position. The drive means including a drive shaft, and the cutter are mounted in the stationary housing part, while all other parts of the skiving device are mounted in the movable housing part. When the housing is closed, a coupling connects the drive shaft with the shaft of the feed roller so that the machine can be operated, and when the movable housing part is opened, the coupling is disengaged, and all parts are easily and freely accessible. It is also possible to construct all parts located in the open housing part as a unit, which can be exchanged to reduce the time required for stopping the machine during repair operations.

The unit having two presser foot means, as explained above, may also be replaced by a unit having only one, but very long presser foot for producing a particularly long skiving cut.

The shaft of the feed roller is provided with universal joints, and when the movable housing part is opened and the drive from the drive shaft to the feed roller interrupted, the universal joint shaft is held by means of a magnet and a spring so that the coupling means can be easily engaged when the open housing part is again closed.

In the preferred embodiment of the invention, the carrier means of the presser foot means, and the adjustable stops are identically constructed so that a very compact and simple arrangement results. Each of the two presser foot means can be adjusted to different angular positions and different spacing from the cutting edge, and when adjusted, only one, or also both, presser foot means can be quickly shifted between two operative positions, into one of which the respective presser foot means is urged by a spring.

Generally, only two sloping scarfs and one profiledscarf suitable for folding over the margin, are required for a shoe upper so that the second presser foot means is made adjustable, but not quickly shiftable in one embodiment of the invention. However, in another embodiment of the invention, the second presser foot means can also be quickly shifted between two different operative positions for making different sloping scarfs, the angle and distance from the cutting knife edge being different in the two operative positions of the second presser foot means.

In order to permit the exchange of presser foot means after substantial wear, in order to change the shape of the scarf, and also for manufacturing reasons, it is preferred to make the presser foot means of two parts, one of which serves as abutment for the edge of the skived material, while the other part has the guide face by which material is guided into engagement with the cutting edge.

The novel features which are considered as characteristic for the invention are set forth in particular in the appended claims. The invention itself, however, both as to its construction and its method of operation, together with additional objects and advantages thereof, will be best understood from the following description of specific embodiments when read in connection with the accompanying drawings.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a schematic perspective view illustrating one embodiment of a skiving machine according to the invention;

FIG. 2 is a portion of the embodiment of FIG. 1, shown on an enlarged scale, and illustrating the housing in an open position with the top plates of the stationary and movable housing parts removed;

FIG. 3 is a schematic exploded perspective view illustrating the skiving device which is mounted in the movable housing part, the feed roller being omitted;

FIG. 3a is a fragmentary perspective view illustrating the feed roller and its supporting structure;

FIG. 4a to FIG. 4g are cross-sectional views of sheet material having different skived scarfs;

FIGS. 50, 5b, and 5c are fragmentary front views illustrating different operative ositions of the presser foot means for obtaining different scarfs;

FIGS. 5a, 5b, and 5c are fragmentary cross-sectional views illustrating the skived scarfs of the sheet material;

FIG. 6a is a plan view of FIG. 5a illustrating different sheet materials during skiving cuts, and FIG. 6b is a fragmentary vertical sectional view of the feeding roller of FIG. 6a;

FIG. 7 is a fragmentary schematic perspective view illustrating a part of FIG. 3 modified in accordance with another embodiment of the invention;

FIG. 7a is a fragmentary perspective view illustrating a treadle for the modified embodiment of FIG. 7;

FIG. 8 is a sectional view on an enlarged scale taken on line VIIIVIII in FIG. 1;

FIG. 9 is a sectional view taken on line IXIX in FIG. 1;

FIG. 10 is a fragmentary plan view illustrating on an enlarged scale a portion of the housing of the embodiment of FIG. 1 with the top plate of the movable housing part omitted for the sake of clarity; and

FIG. 11 is a fragmentary side view illustrating on an enlarged scale, a treadle for the embodiment of FIG. 1.

DESCRIPTION OF THE PREFERRED EMBODIMENTS A box-shaped housing 2, which has no parts projecting above its top surface rests on a supporting table 1. As shown in FIGS. 2, 9, and 10, a pot-shaped cutter 71 has a tubular wall with a circular cutting edge 3, and is mounted in a stationary housing part 2'. A movable housing part 2" is turnable about a vertical axis from the closed position shown in FIG. 1 to the open position shown in FIG. 2, and in broken lines in FIG. 10, and supports the skiving devices shown in FIG. 3, 3a, 8 and 10. A rotary feed roller 4, best seen in FIGS. 5a to 50, FIGS. 8, 9 and 10 is barrel-shaped and has a contour matching the circular cutting edge 3 under which it is located, as best seen in FIG. 9. The top plate of the movable housing parts 2" has an opening out of which projects a portion of the circular cutting edge 3 so that a sheet material, such as a leather blank, when fed by feed roller 4, is supported on the top surface 17 of the housing 2. An annular circumferential groove 6 divides the feed roller 4 into two end portions 4a and 4b, each of which can be used for feeding a sheet material 91 or 92, see FIG. 6a, to the cutting edge 3. FIG. 5b shows the position of a sheet material 91 during the making of a steep beveled scarf 78, see FIG. 5b. A first presser foot 14 is mounted on a holder 20, and a second presser foot 15 is mounted on a holder 53. Intermediate parts 76 are provided between the presser foot means 14 and 15, and the holders 20 and 53, respectively, and the presser foot means have inserts 83 forming guide edges for the fed material. The longer end portion 4a of feed roller 4 has longitudinal grooves and ridges, and the shorter end portion 4b has longitudinal ridges which are divided into saw-tooth shaped projections 90 for holding the sheet material 91, as shown in FIGS. 6a and 611.

Due to the barrel-shape of feed roller 4, the workpiece 91 under presser foot 14 is turned in clockwise direction and away from the abutment 75 which the edge of the workpiece 91 engages. Under the presser foot 15, the workpiece 91 is turned in counterclockwise direction and drawn toward the abutment 75 to engage the same with its edge. In order to compensate this effect of the barrelshape of feed roller 4, feeding portion 4a has only longitudinal axially extending ridges, and feeding portion 4b has saw-tooth shaped ridges 90 which resist outward directed displacement of workpiece 91.

In FIGS. 5a, 5b and 50, different positions of presser foot means 14 and 15 are shown for obtaining the scarfs 81, 78 and 77, respectively, shown in FIGS. 5a, 5b, 5c. In this embodiment of the invention, presser foot '15 has a profiled guiding edge with a projection 15a, while presser foot 14 has a curved guiding edge. Presser foot 14, with its wear resistant insert 83 can be turned with holder 20 about an axis substantially perpendicular to the plane of cutting edge 3 and to the axis of the feed roller 4 so that differently slanted scarfs 78 and 77 are skived in the two different angular positions of presser foot 14 shown in FIGS. 5 b and 5c.

Presser foot 15 can be changed for another presser foot having a different profile, and FIGS. 4a, 4b and 4c illustrate scarfs 81, 82, 84 skived by the rotary cutting edge 3 cooperating with different presser foot means 15. The groove formed by portion 15a permits the folding over of the marginal portion of the material which may receive a gently sloping scarf 81, or a flat scarf 82 requiring splitting of the material. A presser foot 15 may also be used having a profile corresponding to the composite scarf 84 of FIG. 4c which includes a sloping portion and a flat portion.

As will be explained hereinafter in greater detail, at least presser foot 14 can be turned about two transverse axes in such a manner that its angular position, and also its distance from the cutting edge 3 is varied. The gently sloping cut 77 or the steeper cuts 78, 79 may be produced under the control of differently set presser foot 14, or a fiat folding over cut 80 may be produced. By turning holder 20 with presser foot 14 about a first axis, different slants of the scarf are obtained, and by turning the holder about a second axis transverse to the first axis, the distance from the cutting edge 3 is varied so that the scarfs 78 to 80 are obtained, as best seen in FIGS. 4d to 4g. When the guide edge of the presser foot 14 is substantially parallel to the cutting edge 3, fiat cuts, as shown in FIG. 8, are obtained.

The presser foot 15 is not used when presser foot 14 is operative, and vice versa. In the embodiment of FIGS. 1 to 3, 3a, the presser foot 14 can be quickly moved by a treadle 36 between two operative positions for producing two different scarfs, while presser foot 15 has only one, although adjustable, position. In the embodiment of FIG. 7, presser foot 15 is also quickly movable by treadle 36 between two different operative positions, in which event the profiled insert 83a is exchanged for an insert 83 having a continuous guide edge.

As shown in FIG. 3a, the journal 7 on which feed roller 4 is mounted for rotation, is turnably mounted in a bore 8a of a support member 8 which has a shaft portion 68 turnably and axially shifta-bly mounted in a bore of an arm 18 of an angular lever 9 which has another arm 19. The position of support member 8 is adjusted and secured by a screw 86. Angular support lever 9 is mounted on the housing 2 by means of a pivot 10 and is urged by a spring 12 to turn in counterclockwise direction toward a stop 13 which limits the upper position of feed roller 4. A manually adjustable screw spindle 11 passes through a threaded bore in the arm 19 so that support lever 9 can be turned about the axis of pivot 10 whereby feed roller 4 is raised or lowered. The tension of spring 12 is adjusted by a screw spindle 64 which has a flange 65 abutting spring 12. The knob of adjusting spindle 11 is accessible through an opening 29 in housing portion 2", shown in FIG. 1. Knob 64 is also accessible on the outside of the side Wall 2b of the movable housing part 2".

As shown in FIGS. 2, 3, 8 and 9, presser foot 14 is secured to the end of a holder 20 which is turnable about a first axis 22 with presser foot 14, the position being such that axis 22 passes through the point of intersection 21 between the guide edge of presser foot 14, and the abutment 75 on which the edge of the sheet material 91 abuts, as explained above with reference to FIG. 5b. Holder 20 has a joural portion passing through the two legs of a U- shaped part 23 of a support 38 which has journal portions mounted in housing 2 for turning movement about a second axis 32 transverse to the first axis 22. In the space between the legs of part 23, an actuating lever 24 is fixedly secured to the journal portion of holder 20 and is biased by a spring 25, which is secured to the housing 2, to abut the end of an adjusting stop spindle 26 so that presser foot 14 assumes a normal operative position for making a scarf having a predetermined slant. Another spring 39 urges support members 38, 23 to abut a flange or nut at the end of a spindle 41 which passes through a bore in support 38. In this abutting position, presser foot 14 is spaced a certain predetermined distance from the cutting edge 3 and the feed roller 4 so that a cut as shown in FIG. 4e or 4 may be made, for example. Operator controlled means are provided for shifting the presser foot 14 to its other operative position in which its angular position and its distance relative to the cutting edge 3 are changed. In the embodiment of FIG. 3, a Bowden cable tube 30 is fixed to portions of housing 2, and a Bowden cable is secured to actuating lever 24 at one end, and to a lever 32 at the other end, lever 32 having a journal 34 by which it is mounted in the housing 2 for turning movement. A rod 33 is connected by a joint with lever 32, and can be operated by the treadle 36 shown in FIGS. 1 and 11. By operation of the treadle, actuating lever 24 is shifted by the Bowden cable to another position in which it abuts a flange 28 on an adjustable stop spindle 27 so that a second angular position of holder 20 with presser foot 14 about the axis 22 is obtained. Rod 33 is composed of telescoping parts connected by a spring, not shown, so that the two positions of the treadle 36 are independent of the two positions of actuating lever 24 determined by the adjustable stop means 26, 21, 28.

Support member 38 has a projecting pin located in a slot 44 of an angular lever 43 which is connected by a joint with a telescoping rod 46 whose other end is detachably secured to treadle 36 as shown in FIG. 11. Rod 46 also has an inner spring, not shown, permitting expansion and contraction of the telescoping rod 46. When rod 46 is secured to the joint 48 it is displaced in opposite direction as compared with the position illustrated in broken lines when rod 46 is attached to joint 49 on the treadle 36 which is turnable about a journal means 47. When the treadle is operated, rod 46 turns actuating lever 43 which angularly displaces support members 38, 23 about the second axis of journals 37 until support 38 abuts the end of the adjustable spindle 42. In this position, presser foot 14 is closer to the feed roller 4 and the knife edge 3 since holder 20 turns with support member 23, 38 about the axis of journals 37. Therefore, by adjustment of screw 8 spindles 41, 42, 26, 27, two operative positions of presser foot 14, each having different angles and different distances in relation to the cutting edge 3, can be obtained.

Scarfs of different thickness and slope can be skived in the two operative positions of presser foot 14. Depending on whether rod 46 is secured to joint 48 or 49 of treadle 36, a large or small thickness can be combined with a large or small angle of the marginal portion of the workpiece.

Presser foot 15 with the projecting insert 16 is secured to the end of a holder 53 which is positioned at the end of feeding portion 4a. Holder 53 has a journalled portion and is mounted in the legs of a U-shaped part 54 for turning movement about a first axis 52 which passes through the point of intersection 51 of the guide edge 83 and the abutment 51 on which the edge of the workpiece abuts. An actuating lever 55, corresponding to actuating lever 24, is secured to holder 53 and biassed by a spring 56 to turn until abutting the end of an adjustable stop spindle 57. A spring 60 urges support 59 which is secured to part 54 against the flange or stop nut 61 at the end of an adjustable stop spindle 62 which passes through an opening in support 59. Since holder 53 and presser foot 15 turn with support member 54, 59 and journal 58 about the axis of the latter, the distance between presser foot 15 and the cutting edge 3 and the feed roller portion 4a is adjusted. The embodiment illustrated in FIG. 7 and FIG. 7a corresponds to the embodiment of FIG. 3, except that presser foot 15 is also operable by treadle 36 between two operative positions. Adjusting stop spindle 57 is turned to limit movement of actuating lever 55 in a position in which presser foot 15 defines a large angle corresponding to a steep scarf. An additional adjusting spindle 93 carries at its end a flange 94 limiting movement of actuating lever 55 in a second position in which presser foot 15 is less inclined. An additional adjusting stop spindle 106has an end located opposite support part 59 and limiting angular movement at the same about the axis of pivot 58.

A Bowden cable tube 96 is secured to two brackets of housing 2, and the Bowden cable connects actuating lever 55 with a lever 99 which is mounted for turning movement on a journal 98 supported in the housing 2. A telescoping rod 100 is connected by a joint with lever 99, and as shown in FIG. 7a may be detachably secured to the joint 50 of treadle 36, with which normally rod 33 is connected.

Support 59 has a projecting pin 104 located in a slot 103 of an angular lever 102 which is connected by a joint to the telescoping rod which is detachably attached to the joint 48, or to the joint 49, to which normally rod 46 is secured. Lever 102 has a journal 101 mounted for turning movement in the housing 2 so that by operation of the treadle 36 rods 100 and 105 are simultaneously displaced, and effect turning of actuating lever 55 out of its normal position against the action of spring 56 to a position abutting flange 94 in which the slant of presser foot 15 is different. At the same time, actuating lever 102 acts on support member 59, 54 to turn the same about journal 58 so that presser foot 15 turns about the second axis defined by journal 58, and moves away from the cutting edge 3 a distance determined by the adjusted position of adjustable stop spindle 106 so that presser foot 15 has a second operative position defining a different angle, and having a different distance in relation to the cutting edge, as compared with the normal position in which it is held by springs 56 and 60. The adjustable stop spindle 62 defines the limit for the greatest thickness of the scarf. By operation of the treadle, the smallest thickness of the scarf is determined, together with the different angle of. the presserfoot 15. In each operative position, an adjustment of the thickness and angle of the cut is possible, and once the thickness and angle are selected and adjusted, the presser foot can be quickly shifted by the operator by stepping on the treadle to the operative positions required for skiving different scarfs. Depending on the position of rod 105 on treadle 36, a great or small thickness can be combined with the great or small angle of presser foot 15, in the same manner as described with reference to presser foot 14. The device shown in FIG. 7 for controlling the position of the presser foot 15 corresponds in every respect to the device shown in FIG. 3 for controlling the presser foot 14, and the same or another treadle may be used by the operator.

On the front wall 2a of the housing 2 the knobs of adjusting stop spindles 26, 27 for presser foot 14, the knob for adjusting stop spindle 57, and in the embodiment of FIG. 7 also of adjusting stop spindle 93, are located so that the operator can adjust the angle of the presser foot means. On the lateral wall 2b of the movable housing part 2", the adjustable stop spindles 41, 42, and 62, and in the embodiment of FIG. 7 also 106 for adjusting the thickness of the cut are located. The knob of adjusting spindle 11 is located in the opening 29 of the side wall 2b, together with the knob of the spindle 64 by which the tension of spring 12 is adjusted, as explained with reference to the left portion of FIG. 3. An adjusting knob 67 projects from wall 2b, and serves for adjusting the position of the grinding means 66, see FIGS. 2 and 9, by which cutting edge 3 is sharpened. Presser foot means 14 and 15 project only slightly above the top surface 17 of the two housing parts 2 and 2".

A pivot permits the turning of the movable housing part 2 about the vertical axis 72, as shown in FIGS. 8 and 10. The universal joint shaft of feed roller 14 has a free end provided with coupling means in the form of coupling fingers 69 which engage a coupling recess 70 in the end portion 4a of feed roller 4, when the housing is closed. When the housing is open and in the position shown in FIG. 2, the coupling means 69 and 70 are separated. The engagement of the coupling means takes place automatically when the movable housing part 2" is closed, and a magnet 73 and spring 74 on housing 2 hold the drive part of shaft 5 in an operative position when the housing is opened.

As best seen in FIGS. 5a to 50, between presser foot 14 or and holders 20 and 53, an intermediate piece 76 having an abutment 75 for the edge of the workpiece is arranged, and the pieces 76 can be replaced when worn in the same manner as the inserts 83a and 83 which define the guiding edges of presser foot means 14 and 15.

A circular guide edge on the presser foot results in smooth scarfs, while a guide edge which is non-circular, or has projecting inserts, produces profiled scarfs as shown in FIGS. 4a, 4b, and 4c. The scarfs shown in FIGS. 4a and 4b are suitable for being folded over.

It will be understood that each of the elements described above, or two or more together, may also find a useful application in other types of skiving machines, differing from the types described above.

While the invention has been illustrated and described as embodied in a skiving machine quickly operable between at least three conditions in which different scarfs are cut into the edges of a leather sheet, it is not intended to be limited to the details shown, since various modifications and structural changes may be made without departing in any way from the spirit of the present invention.

What is claimed as new and desired to be protected by Letters Patent is set forth in the appended claims.

We claim:

1. Skiving machine comprising, in combination, housing means having a surface formed with an opening; a rotary at least partly tubular cutter having a circular cutting edge mounted in said housing means so that portion of said circular cutting edge projects through said opening; a feed roller rotatably mounted in said housing means for feeding sheet material to said cutting edge and having first and second feeding portions at the ends thereof; first presser foot means cooperating with said first feeding portion, and second presser foot means cooperating with said second feeding portion; first and second carrier means supporting said first and second presser foot means, respectively, and being mounted in said housing means; and operator controlled means for moving at least first carrier means between two positions in which said first presser foot means is positioned in two operative positions relative to said cutting edge portion and to said first feeding portion whereby two different scarfs can be cut in the edge of sheet material fed by said first feeding portion and a third different scarf can becut in the edge of sheet material fed by said second feeding portion.

2. Skiving machine is claimed in claim 1 wherein said first presser foot means has a continuous guide edge for guiding the sheet material, and the second presser foot means has a profiled guide edge for obtaining profiled scarfs.

3. Skiving machine as claimed in claim 1 wherein said surface is the top surface of said housing means and is located in a plane; and wherein all parts of said housing means, said carrier means, and said operator controlled means are located below said plane so that sheet material fed on said top surface can be fully observed by the operator of the machine.

4. Skiving machine as claimed in claim 1 wherein said cutting edge is located in a cutting plane; wherein said first and second presser foot means have guide edges located in a guide plane parallel to said cutting plane; and wherein said carrier means and part of said operator controlled means are located in said housing means, and are disposed on the side of said guide plane remote from said rotary cutter.

5. Skiving machine as claimed in claim 1 wherein at least said first carrier means includes first and second movable supports for supporting said presser foot means for angular movement about first and second axis transverse to each other; and wherein said operator controlled means include first and second actuating means for simultaneously turning said first pressure foot means about said first and second axes so that the angle and distance between said first presser foot means and said circular cutting edge are different in said two operative positions of said first presser foot means.

6. Skiving machine as claimed in claim 5 wherein said feed roller has an axis of rotation; wherein said circular cutting edge is located in a cutting plane parallel with said axis of rotation; wherein said first axis is substantially perpendicular to said cutting plane, and said second axis is parallel to said axis of rotation; and wherein said first axis defines a small angle with a horizontal plane through said second axis.

7. Skiving machine as claimed in claim 6 wherein said first presser foot means has a guide edge opposite said first feeding portion, and an abutment edge for the edge of sheet material fed by said first feeding portion extending transverse to said guide edge; and wherein said first axis passes through the point of intersection of said abutment edge and said guide edge.

8. Skiving machine as claimed in claim 5 wherein said first carrier means include a holder fixedly supporting said first presser foot means; wherein said first support mounts said holder for turning movement with said first presser foot means about said first axis; wherein said second support includes a shaft supported in said housing means and supporting said first support for turning movement about second axis; and wherein said first actuating means is connected with said holder and said second actuating means is connected with said first support.

9. Skiving machine as claimed in claim 8 wherein said first and second actuating means include first and second rods; and wherein said operator controlled means include a treadle connected with said first and second rods and being operable between two positions for positioning said first presser foot means in said two operative positions, respectively.

10. Skiving machine as claimed in claim 9 wherein said first actuating means includes a first actuating lever secured to said holder, and Bowden cable means connecting said first actuating lever with said first rod; and wherein said second actuating means includes a second actuating lever turnably mounted in said housing means and connecting said first support with said second rod.

11. Skiving machine as claimed in claim 10 compris ing first adjustable stop means for limiting movement of said first actuating lever in two end positions; second adjustable stop means for limiting movement of said first support in two end positions; and wherein said operator controlled means includes lost motion means so that said first actuating means and said first support can be stopped before said treadle arrives in said two positions thereof.

12. Skiving machine as claimed in claim 11 wherein said first and second rods have telescoping parts; and wherein said lost motion means include spring means connecting said telescoping parts.

13. Skiving machine as claimed in claim 11 wherein said first adjustable stop means include a first pair of adjustable spindles having an end and a stop flange, respectively, for limiting movement of said first actuating lever; and wherein said second adjustable stop means include a second pair of adjustable spindles having an end and a stop flange, respectively, for limiting movement of said first support.

14. Skiving machine as claimed in claim 11 including first spring means for urging said first actuating lever to one of said end positions thereof; second spring means for urging said first support to one of said two end posi tions thereof so that said presser foot means normally assumes one of said operative positions, and is moved by actuation of said operator controlled means to the other operative position thereof.

15. Skiving machine as claimed in claim 1 wherein each of said first and second carrier means includes a holder fixedly supporting the respective presser foot means, a support supporting said holder for angular movement about a first axis, and a shaft mounted in said housing means and supporting said support for angular movement with said holder about a second axis transverse to said first axis; comprising adjustable stop means for limiting movement of said supports and of said holders in end positions, respectively; and spring means for urging said supports and holders to said end positions abutting said stop means whereby by adjustment of said stop means the angles and distances between said first and second presser foot means and said circular cutting edge can be adjusted.

16. Skiving machine as claimed in claim 1 comprising a journal for said feed roller; and adjustable mounting means for mounting said journal of said feed roller, said mounting means including a first supporting member mounted in said housing means for angular movement about a pivot axis, adjustable stop means limiting movement of said first supporting member in an end position, a spring urging said first supporting member to said end position, a second supporting member mounted on said first supporting member for turning movement about an axis transverse to said pivot axis and also for axial movement, and supporting said journal so that said feed roller is supported for turning movement about an axis parallel to said pivot axis; and means for securing said second supporting member in adjusted positions to said first supporting member whereby the position of said feed roller can be adjusted relative to said circular cutting edge.

17. Skiving machine as claimed in claim 16 wherein said adjustable stop means include a threaded spindle threaded through said first supporting member and having a knob at one end projecting out of said housing means, and a fixed stop on which the other end of said spindle abuts.

18. Skiving machine as claimed in claim 1 wherein said housing means includes a stationary housing part, and a movable housing part mounted on said stationary housing part; and wherein said rotary cutter is mounted in said stationary housing part, and said feed roller, first and second presser foot means, first and second carrier means and at least part of said operator controlled means are mounted on said movable housing part for movement with the same between a closed position in which said feed roller and presser foot means cooperate with said cutter, and an open position.

19. Skiving machine as claimed in claim 18 wherein said surface is fiat and the top surface of said housing means, and includes a surface portion on said stationary housing part and a surface portion on said movable housing part; wherein said opening is formed in said surface portion of said movable housing part.

20. Skiving machine as claimed in claim 18 including a drive shaft mounted in said stationary housing part and having a first coupling means at one end; and wherein said feed roller includes a second coupling means engaged with said first coupling means in said closed position so that said drive shaft drives said feed roller, and separated from said first coupling means in said open position of said movable housing part.

21. Skiving machine as claimed in claim 20 including spring means and magnet means for holding said drive shaft when said first and second coupling means are separated in said open position.

22. Skiving machine as claimed in claim 1 wherein said first carrier means includes a holder supporting said first presser foot, a first support mounting said holder for turning movement about a first axis, a second support mounting said first support for turning movement about a second axis transverse to said first axis; wherein said operator controlled means include first actuating means connected with said holder and including a first rod, second actuating means connected with first support and including a second rod, and a treadle means connected with said first and second rods, and including means for attaching at least said first rod to different points of said treadle means.

'23. Skiving machine as claimed in claim 1 wherein said feed roller has a circumferential groove between said feeding portions; wherein said first carrier means is located in said groove for holding said first presser foot means adjacent said first feeding portion projecting toward one end of said feed roller; and wherein said second carrier means is located at the other end of said feed roller for holding said second presser foot means adjacent said second end portion.

24. Skiving machine as claimed in claim 23 wherein said feed roller is barrel-shaped to match said cutting edge portion; and wherein said second feeding portion has axial- 1y extending grooves, and said first feeding portion has axially extending grooves and ridges having saw-tooth profile pointing toward said first presser foot means.

25. Skiving machine as claimed in claim 1 wherein said operator controlled means include means for moving also said second carrier means between two positions in which said second presser foot means is positioned in two other operative positions relative to said cutting edge portion and to said second feeding portion whereby two different scarfs can be cut in the edge of sheet material fed by said second feeding portion so that four difierent scarfs can be cut by the machine.

26. Skiving machine as claimed in claim 25 wherein said operator controlled means include first and second independently operable actuating devices connected with said first and second carrier means, respectively.

27. Skiving machine as claimed in claim 26 wherein each of said independently operated actuating devices includes a pair of first and second actuating means, each pair operating said first and second carrier means, respectively, to

13 turn said first and second pressure foot means, respectively, about two axes transverse to each other.

28. Skiving machine as claimed in claim 27 wherein each of said first and second actuating means includes a rod so that each actuating device includes a pair of rods; and wherein said operator controlled means include a treadle, and means for attaching one of said pairs of rods to said treadle for simultaneous operation.

References Cited UNITED STATES PATENTS 1,792,447 2/1931 Ray 69-9.5

FOREIGN PATENTS 4/1923 Germany.

ALFRED R. GUEST, Primary Examiner US. Cl. X.R. 

